18) What's the present value of a 4-year ordinary annuity of $1,000 per year plus an additional $1,500 at the end of year 4 if the interest rate is 2.0%? a. $5,500 b. $5.194 c. $6,288 d. $6,680 e. $7,072 19) What's the present value of a perpetuity that pays $1,000 per month, with the first payment one month from today, if the APK is 6.0%? a. $142,857 b. $166,667 c. $200,000 d. $250,000 e. $333,333